Traditional plaster on aerated concrete blocks.

Structure type

External walls or partitions in aerated concrete blocks.

Detail

Interior or exterior traditional plaster (15–20 mm thick).

Application cycle

1. Scratch coat over the whole surface with RALLK Muro K RA bonding mortar, applied by hand or by plastering machine.
2. Machine-applied plaster RALLK Muro K PM, plaster made with RALLK Muro K M5 plastering mortar, or alternatively standard plaster, class CS I – CS III according to UNI EN 998-1.
3. Skim coat of RALLK K OttO or alternatively RALLK Rasante K with embedded 150 g/m² glass fiber mesh, laid from top to bottom with the vertical strips overlapping by at least 10 cm.
4. Finish with a finishing coat, RALLK Marmo K powder mineral finish or another mineral finish, acrylic, siloxane, lime or silicate paste finish, or lime, siloxane, acrylic or silicate paint, as set out in the specifications.

Additional information

1. Based on current site experience, a reinforced skim coat on fully cured plaster is an effective way to prevent hairline cracks in the plaster along the block outlines or the load-bearing elements, caused in the medium and long term by minor settlement, vibrations or thermal expansion.
2. The scratch coat acts as a bonding bridge and, above all, regulates the water absorption of the substrate (step 1). In agreement with the site supervisor, it can be replaced by a first coat of plaster (browning coat), applied without screeding 24 h before the main plaster coat (step 2).
3. See the individual product data sheets for application methods and precautions.